Last Saturday teachers participated in the Flower Dissection program of the Arboretum for Educators, a monthly program aimed at helping teachers learn more about using the natural world for purposeful science learning. This particular class followed the 5E Instructional Model, both as a way to learn new teaching strategies and to experience what it is like to construct new ideas from previous ones. In this model, the phases of learning are Engage, Explore, Explain, Elaborate, and Evaluate. A daffodil served as the model flower for teachers to dissect and around which experiences were built. Below is a snapshot of the model in action.

Engage:

This probe can elicit background knowledge and misconceptions.
This probe can elicit background knowledge and misconceptions.

Here are two ways students can be drawn into a study of flowers: “What is a flower for? Discuss with a partner” or “Draw a flower from memory and label what you know.”  In both cases, teachers are looking to elicit background knowledge and perhaps illuminate misconceptions that students may have around this topic. By listening carefully and asking probing questions, a teacher can gather a lot of information that can be addressed during the rest of the study.

Beginning exploration of a flower.
Parts of a flower. Visual organizer and dissection tools.
A t-pin holds pistil in place for viewing.

Ample time should be allowed for students to examine a flower using a hand lens or to make an observational drawing, along with a guided dissection. Students should be guided to take petals apart and view them under stereo microscopes, then progress from the outside in, examining the stamen, pistil, and ovary of the daffodil. Labeling flower parts should be kept to a minimum; rather, students should focus on form and hypothesize about each part’s function, providing a clear reason for their claims. Providing students with additional tools such as visual organizers, black chenille stems (to collect pollen), and T pins can facilitate more discovery and better ways to interact with the flower parts.

Explain:

Flower part organizer. The organizer can be used to incorporate new learning.
Flower part organizer. The organizer can be used to incorporate new learning.

This phase allows a teacher to help students connect their thoughts and discoveries with facts. Provide a labeled flower diagram so students can review their notes or drawings and add the correct vocabulary. Pose questions to highlight the location of the flower parts in relation to the whole, and explain the process of fertilization that leads to seed set. Watch a time-lapse video to further illustrate how a flower changes over time. Complex questions that need further research can become part of the next phase of learning.

Elaborate:

Pussy willow examination. Noticing flower parts of pussy willow catkins.
Scilla close up. A different type of pollen.

During this phase, students go outside to apply newly-gained knowledge. They are encouraged to view a wide selection of flowers in their natural settings so they can see that not all flowers are “perfect.” Some only have stamen, others have multiple pistils, the number of petals differ, and not all pollen is yellow! This phase is sometimes a deeper level of exploration, one during which important questions may arise and true curiosity can spark an investigable question or further research.

Evaluate:

Photos of flower parts can be used as assessment.
Photos of flower parts can be used as assessment.

Here are some ways for teachers to assess student learning: a) give each child a new flower to dissect and instruct them to learn all they can about the flower, drawing and labeling all known parts with explanations; b) give students photos of partial flowers to describe what they are looking at and explain how they know; c) create a comic strip narrative that explains how flowers are fertilized, making sure to use correct vocabulary and accurate drawings. In each of these examples students are asked to make sense of their learning and synthesize the important parts with a view toward generalizations and concept formation.

Educators came away with many new ideas to incorporate into their teaching practice, as well as a better understanding of how to use the outdoors for meaningful science content learning. Learn more about upcoming Arboretum for Educators events at the Arnold Arboretum.


From “free” to “friend”…

Established in 1911 as the Bulletin of Popular Information, Arnoldia has long been a definitive forum for conversations about temperate woody plants and their landscapes. In 2022, we rolled out a new vision for the magazine as a vigorous forum for tales of plant exploration, behind-the-scenes glimpses of botanical research, and deep dives into the history of gardens, landscapes, and science. The new Arnoldia includes poetry, visual art, and literary essays, following the human imagination wherever it entangles with trees.

It takes resources to gather and nurture these new voices, and we depend on the support of our member-subscribers to make it possible. But membership means more: by becoming a member of the Arnold Arboretum, you help to keep our collection vibrant and our research and educational mission active. Through the pages of Arnoldia, you can take part in the life of this free-to-all landscape whether you live next door or an ocean away.

For more tree-entangled art, science, and writing, subscribe to Arnoldia by becoming a member of the Arnold Arboretum.